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170 lines
4.4 KiB
C++
170 lines
4.4 KiB
C++
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#ifndef BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
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#define BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
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// Copyright David Abrahams 2003-2004
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// Copyright Aleksey Gurtovoy 2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/begin_end.hpp>
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#include <boost/mpl/iterator_category.hpp>
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#include <boost/mpl/advance.hpp>
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#include <boost/mpl/distance.hpp>
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#include <boost/mpl/next_prior.hpp>
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#include <boost/mpl/deref.hpp>
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#include <boost/mpl/min_max.hpp>
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#include <boost/mpl/pair.hpp>
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#include <boost/mpl/iterator_tags.hpp>
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#include <boost/mpl/aux_/config/ctps.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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namespace boost { namespace mpl {
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namespace aux {
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struct pair_iter_tag;
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#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template< typename Iter1, typename Iter2, typename Category >
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struct pair_iter;
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template< typename Category > struct prior_pair_iter
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{
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template< typename Iter1, typename Iter2 > struct apply
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{
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typedef typename mpl::prior<Iter1>::type i1_;
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typedef typename mpl::prior<Iter2>::type i2_;
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typedef pair_iter<i1_,i2_,Category> type;
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};
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};
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template<> struct prior_pair_iter<forward_iterator_tag>
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{
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template< typename Iter1, typename Iter2 > struct apply
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{
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typedef pair_iter<Iter1,Iter2,forward_iterator_tag> type;
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};
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};
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#endif
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}
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template<
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typename Iter1
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, typename Iter2
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, typename Category
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>
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struct pair_iter
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{
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typedef aux::pair_iter_tag tag;
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typedef Category category;
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typedef Iter1 first;
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typedef Iter2 second;
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#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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typedef pair<
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typename deref<Iter1>::type
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, typename deref<Iter2>::type
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> type;
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typedef typename mpl::next<Iter1>::type i1_;
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typedef typename mpl::next<Iter2>::type i2_;
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typedef pair_iter<i1_,i2_,Category> next;
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typedef apply_wrap2< aux::prior_pair_iter<Category>,Iter1,Iter2 >::type prior;
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#endif
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};
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template< typename Iter1, typename Iter2, typename C >
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struct deref< pair_iter<Iter1,Iter2,C> >
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{
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typedef pair<
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typename deref<Iter1>::type
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, typename deref<Iter2>::type
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> type;
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};
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template< typename Iter1, typename Iter2, typename C >
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struct next< pair_iter<Iter1,Iter2,C> >
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{
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typedef typename mpl::next<Iter1>::type i1_;
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typedef typename mpl::next<Iter2>::type i2_;
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typedef pair_iter<i1_,i2_,C> type;
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};
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template< typename Iter1, typename Iter2, typename C >
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struct prior< pair_iter<Iter1,Iter2,C> >
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{
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typedef typename mpl::prior<Iter1>::type i1_;
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typedef typename mpl::prior<Iter2>::type i2_;
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typedef pair_iter<i1_,i2_,C> type;
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};
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template<> struct advance_impl<aux::pair_iter_tag>
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{
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template< typename Iter, typename D > struct apply
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{
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typedef typename mpl::advance< typename Iter::first,D >::type i1_;
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typedef typename mpl::advance< typename Iter::second,D >::type i2_;
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typedef pair_iter<i1_,i2_,typename Iter::category> type;
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};
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};
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template<> struct distance_impl<aux::pair_iter_tag>
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{
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template< typename Iter1, typename Iter2 > struct apply
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{
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// agurt, 10/nov/04: MSVC 6.5 ICE-s on forwarding
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typedef typename mpl::distance<
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typename first<Iter1>::type
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, typename first<Iter2>::type
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>::type type;
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};
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};
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template<
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typename BOOST_MPL_AUX_NA_PARAM(Sequence1)
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, typename BOOST_MPL_AUX_NA_PARAM(Sequence2)
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>
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struct pair_view
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{
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typedef nested_begin_end_tag tag;
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typedef typename begin<Sequence1>::type iter1_;
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typedef typename begin<Sequence2>::type iter2_;
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typedef typename min<
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typename iterator_category<iter1_>::type
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, typename iterator_category<iter2_>::type
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>::type category_;
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typedef pair_iter<iter1_,iter2_,category_> begin;
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typedef pair_iter<
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typename end<Sequence1>::type
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, typename end<Sequence2>::type
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, category_
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> end;
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};
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BOOST_MPL_AUX_NA_SPEC(2, pair_view)
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}}
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#endif // BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
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